[HDFS-12897] getErasureCodingPolicy should handle .snapshot dir better

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha1, 3.1.0
• Fix Version/s: 3.1.0, 3.0.1
• Component/s: erasure-coding, hdfs, snapshots
• Hadoop Flags: Reviewed
• Assignee: LiXin Ge
• Reporter: Harshakiran Reddy
• Created: 06/Dec/17 05:09
• Updated: 01/Feb/18 07:17
• Resolved: 01/Feb/18 06:53

Description

Scenario:-
---------------
Operation on snapshot dir.

EC policy
bin> ./hdfs ec -getPolicy -path /dir/
RS-3-2-1024k
bin> ./hdfs ec -getPolicy -path /dir/.snapshot/
FileNotFoundException: Path not found: /dir/.snapshot

bin> ./hdfs dfs -ls /dir/.snapshot/
Found 2 items
drwxr-xr-x - user group 0 2017-12-05 12:27 /dir/.snapshot/s1
drwxr-xr-x - user group 0 2017-12-05 12:28 /dir/.snapshot/s2

Storagepolicies
bin> ./hdfs storagepolicies -getStoragePolicy -path /dir/.snapshot/
The storage policy of /dir/.snapshot/ is unspecified
bin> ./hdfs storagepolicies -getStoragePolicy -path /dir/
The storage policy of /dir/:
BlockStoragePolicy

{COLD:2, storageTypes=[ARCHIVE], creationFallbacks=[], replicationFallbacks=[]}

Which is the correct behavior ?

Issue Links

• is related to: HDFS-13087 Snapshotted encryption zone information should be immutable